Spool of pasteboard, cardboard, or similar material.



A. SCHMIDT.

SPOOL or PASTEBOARD, CARDBOARD, 0R SIMILAR MATERIAL.

" APPLICATION FILED JAN. 4, 1910.

974,603. Patented Nov. 1, 1910.

2 SHEETS-SHEET l.

. v A C I c Witnespes Inventor A. SCHMIDT.

SPOOL or PASTEBOARD, CARDBOARD, on SIMILAR MATERIAL.

APPLICATION FILED JAN. 4, 1910. I 974,603, 7 Patented Nov. 1, 1910.

2 SHEETSSHBET 2.

1 //AII\II Inm I w ttnessa v In entor 7 i3 6% WM- ALBERT SCHMIDT, F LEIPZIG, GERMANY.

SPOOL OF PASTEBOARD, CARDBOARD} OR SIMILAR MATERIAL.

Specification of Letters Patent.

Patented Nov.- 1, 1910.

Application filed January 4, 1910. Serial No. 586,274. g e

, To all whom it may concern:

Be it known that I, ALBERT SCHMIDT, manufacturer, a subject of the King of Saxony, and resident of Sophienstrasse 8, Leipzig, Germany, have invented a new and useful Improved Spool of Pasteboard, Cardboard, or Similar Material, of which the following is a specification.

This invention relates to an improved spool of paste-board, card-board, or similar* material, the manufacture of which is cheaper than that of wooden spools, although the spools accordingto this invention have a greater rigidity and smaller weight, which latter fact is particularly important when such spools are used for yarns or threads for exporting purposes.

Spools of paste-board, as hitherto made, have not fulfilled requirements, particularly because they did not sufficiently resist high thread-tension, and because of their tendency in the winding operation to longitudinal expansion, owing to the deficient connection of the tube or body portion with the two heads forming the ends of the'spool.

According to this invention the v.tube or body portion of the spool is provided at both ends with inwardly directed flanges or faces.

By this means the tube is' given a high degree of rigidity, and the connection with the heads. is such that an expansion in longitudinal direction is rendered impossible. Moreover, this construction has the advantage that the spindle on to which the spool is slipped for the winding on of the thread, also engages with the inwardly directed flanges, so that both tube and heads of the spool are simultaneously engaged and rotated by the spindle, thereby doing away with any forces which may tend to produce a twist or torque between heads and tube, respectively;

A development of the present invention consists in providing, by pressing or the like, the cavities of the heads with female thread and the ends of the tube with corresponding male screw threads. By preference the thread on one end of the tube is a left hand thread and that on ,the other end a right hand one. threads in the heads would occasion much work were it not for anew method for pressing these heads according to the present in vention whereby the female thread can be produced simultaneously with the pressing or stamping of the head.

The provision of the female A spool accordin to this invention is illustrated by way 0 example in the accompanying drawing.

Figure 1 is a longitudinal section of the spool. Fig. 2 .is a perspective view of the tube serving for receiving the heads.- Fig. 3.

is'a section of a head. Fig. 4 represents another form of a spool of the novel construction, in cross section. Fig. 5 shows a box or blank of which the head of the spool is molded, and Figs. 6-8 illustrate in difierent positions the use of the device used for pressmg the heads of the spool.

The heads a are pressed or molded out of paste-board or similar material in the form shown in Fig. 3. They are provided with a central cavity 6 produced either by cutting out or by turning if the heads are not entirely formed by pressing or molding.

For the sake of economy in material, or in order to obtain a higher density of the material used, an annular groove 0 may be formed in the head by turning or pressing.

The. tube (Fig. 2) consists preferably of two symmetrical or similar sections d, although it may be built up of more sections if desired. At each end 6 it is narrowed or reduced to the extent of about the seating surface of the heads, so that the said ends have a precise fit both longitudinally as well as circumferentially in the cavity 1) of the heads a, the seating or annular rim having at the same time a centering action and a strain relieving effect on the bottom portions of the heads. Each section of the tube is provided with inwardly directed flanges or faces j, which in assembling the parts, engage against the bottom of the cavity 6. The connection iseffected by glue or fasteners.

The manufacture of the various parts of the spool is extremely simple compared with the methods hitherto used, and is consequently cheaper than previous methods.

The spool itself is very strong. and durable and capable of resisting the greatest threadtensions. The flanges or faces at. the ends of the tube protect the spool against compression, and insure the position of the spool to such an extent as to prevent the heads from being displaced on the tube, either inwardly or outwardly. .Thus any longitudinal variation is absolutely prevented.

According to the construction shown in at its upper and lower ends with screw threads 9, with the aid of which it is screwed into corresponding female threads g of the heads.

A box drawn of paste and the diameter of which must correspond precisely to the size of the head of the spool to be made (Fig. 5) is placed in the upsetting mold or matrix (F1g. 6) so as to have its open end turned in downward direction. The inner or counter die It is spring supported Within, the matrix or mold. If now the working die 2' is pressed against the matrix 70, the counter die h yields and as the box located in the matrix is laterally surrounded by the latter, the box material is prevented from moving out, but is pressed by the working die 6 down into the matrix. In this operation the box is first pressed against the oblique face m thereb assuming the shape of the incline (Fig. i In the continued movement of the Working die 2', the box is finally caused to strike against the spring supported counter die. Owing to the resistance which the box encounters at this point, it is forced to move upwardly upon belng further bent (Fig. 8), and it is during this latter phase of this pressing operation that the heads receive the cavlty for the tubes. The material dislaced by the formation of the cavity is orced to the left, to the right, and upward, whereby it is, as it were, caused to form multiple layers, thus forming no longer a hollow but a solid spool head, particularly as the working die is also provided with an annular projection for the purpose of upsetting the material downwardl so as to forma groove 0 in the upper ace of the head; Whether by this upsetting operation the paste, that is to say the drawn box is curled in more or less, depends on the thickness of the paste or paste-board used andvon the marginal height of the box body as preliminarily drawn. The box, however, must at any rate be compressed by high pressure in the described manner, whereby the spool heads obtained equal solid bodies. Before pressing or upsettin the box as preliminarily made by drawing, it is slightly moistened and subsequently the upsetting and pressing takes place as much as possible with the aid of heat.

If during the manufacture just described of the spool heads it is desired to simultaneously produce in the cavities thereof screw threads, the inner or counter-die h is provided with threads which during the upset tingl operation are at the same time produced in t e paste material. In thiscase the finished heads must, as it-were, be unscrewed from the counter die it which however may be effected automatically by providing in an appropriate manner a friction bar or by unscrewing the spool heads from the die by the counter rotation of a small wheel.

Claims.

1. A spool comprising a body portion; and heads thereon, formed of paste-board materialo said body portion being made of a plurality of sections fastened together, provided with reduced ends, having oppositely .disposed screw-threads thereon, and sald heads being provided with oppositely disposed screw threads adapted to engage said first mentioned threads, substantially as described.

2. A spool comprising a body portion; and heads thereon, formed of paste-board material; said body portion being made of a plurality of sections fastened together, provided with reduced ends, having oppositely disposed screw-threads thereon, and said heads being provided with oppositely disposed screw threads adapted to engage said first mentioned threads, and an annular groove in the faces of said heads, substantially as described.

3. A spool comprising a tubular body portion formed of a plurality of sections, the diameter of each section being reduced near the end and provided with a shoulder, and the end of each section being flanged over inwardly, so that the flanges may bear rigidly against each other, and together form a stiffening rib, and a cap provided with a recess therein adapted to lnclose the reduced end of said tube-and to fit against said shoulder and against saidinturned flanges, substantially as described.

4:. A spool made of paste-board or similar material, comprising two semi-tubular members with ends flanged inward, the edges of said flanges abutting, and a cap provided with a recess therein adapted to fit snugly 7 ALBERT SCHMIDT.

Witnesses REINHOLD Mi'jLLnR, RUDOLPH FRIcKn. 

